Although these ages are not in complete agreement they do indeed all support a very young age for the Earth and Universe.
How so?
Micro-evolution [changes within the same kind] is both Biblically and scientifically supported although most avoid the term evolution
Within the Intelligent Design (ID) group we both belong, yes, but Darwinists love to confuse the two concepts (micro vs. macro-evolution), so I nip it in the bud right at the start. (Darwinists also love to confuse the "age vs. origin" thing which is why I also nip that one in the bud.)
You asked how so w/ young ages - read the links in #142. Furthermore, the vast majority of recorded civilization proves young ages as well. Are we to believe mankind was around for 100-300k years yet left virtually no traces.
I don’t care for the ‘micro’ term either since natural selection was discovered by another true scientist prior to Darwin. The only evolution defense for macro is mutations and those have been shown to be deleterious [deleted or mangled information at the DNA level] over 99% of the time. The other 1% are still highly debatable since ‘improvements’ still come with a loss of overall DNA information. Simply put try some random computer code mutations and let me know how much you have improved your computer functions.